| Didcot to Oswego (Illinois) | 3,937.99 mi (6,337.59 km) |
| Didcot to Oswego (New York) | 3,397.71 mi (5,468.08 km) |
| Didcot to Otsego (Minnesota) | 3,966.65 mi (6,383.71 km) |
| Didcot to Ottawa (Illinois) | 3,971.95 mi (6,392.23 km) |
| Didcot to Ottawa (Kansas) | 4,348.76 mi (6,998.65 km) |
| Didcot to Ottumwa (Iowa) | 4,123.79 mi (6,636.60 km) |
| Didcot to Overland (Missouri) | 4,157.56 mi (6,690.95 km) |
| Didcot to Overland Park (Kansas) | 4,312.86 mi (6,940.87 km) |
| Didcot to Overlea (Maryland) | 3,575.38 mi (5,754.02 km) |
| Didcot to Oviedo (Florida) | 4,276.86 mi (6,882.95 km) |
| Didcot to Owasso (Oklahoma) | 4,485.91 mi (7,219.37 km) |
| Didcot to Owatonna (Minnesota) | 4,007.74 mi (6,449.83 km) |
| Didcot to Owensboro (Kentucky) | 4,075.66 mi (6,559.14 km) |
| Didcot to Owings Mills (Maryland) | 3,584.46 mi (5,768.63 km) |
| Didcot to Owosso (Michigan) | 3,718.48 mi (5,984.32 km) |
